code: def _execute_operand(self, ctx: Dict[str, Any], op: OperandType):
      if isinstance(op, ApplyOperand):
          assert hasattr(op, "func_key")
          assert op.func_key is None
          if op.need_clean_up_func:
              assert isinstance(op.func, bytes)
          else:
              assert callable(op.func)
          result = super()._execute_operand(ctx, op)
          assert op.func is not None
          assert callable(op.func)
          return result
      else:
          return super()._execute_operand(ctx, op)
  
imports: from typing import Any, Dict
  import pandas
  import pytest
  from ....None import dataframe
  from ....dataframe.base.apply import ApplyOperand
  from ....config import option_context
  from ....core import TileableGraph, OperandType
  from ....services.task.supervisor.tests import CheckedTaskPreprocessor
  from ....services.subtask.worker.tests import CheckedSubtaskProcessor
  from ....services.task.supervisor.preprocessor import TaskPreprocessor
  from ....services.subtask.worker.processor import SubtaskProcessor
  from ....utils import lazy_import
  from ..local import _load_config
  from ..tests.session import new_test_session, CONFIG_FILE
label_desc: Use image node_id 1 for calling the MarsBackendFuncCheckedSubtaskProcessor obj's underlying member method code with example usage: obj._execute_operand(ctx, op) and returns: result, super